ELECTRICALFixture is U.L. listed in U.S. and Canada. H.I.D. ballasts are of high power factor with lamp starting down to -30 degrees C. Ballasts are DOE EISA compliant. Medium base porcelain sockets are 4KV rated. All compact fluorescent (PL) ballasts are instant start electronic with a starting temperature of down to 0 degrees F. They have a 4-pin socket to accept quad or triple tube lamps.